RJT>JB>extra components would be needed to get a rate signal from a 2 wire fan.

RJT>JB>it's easist to tap the monitioring terminsl on the fan PCB. (typically
RJT>JB>right next to the power terminals)

RJT>JE> HUH? None of the fans in my computers have EVER had a fan PCB. Am I 
RJT>JE> not understanding?

RJT>Ever take one apart?  :-)

RJT>There's likely much more than just a simple dc motor in there.

That "likely" indicates that you "THINK" but do not
"KNOW"
for sure that there MAY be more than a simple DC motor in
there.

IIRC, the subject was PC case fans - and simply looking at
one will show there is no circuit board in/on one of these.

Jay
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